Add Bambu Studio cylinder creation tutorial with screenshots

- Add step-by-step instructions for creating 25mm x 50mm cylinder
- Include screenshots showing primitive creation and resizing process
- Add alternative CAD software options for participants
- Provide visual guidance for challenge model creation

challenges.md

@@ -19,7 +19,8 @@ Experience the clarity of 3D Fuel's "Clearly Natural" filament in this transpare
   - PCTG (Polyethylene Terephthalate Glycol)
   - PLA (Polylactic Acid)
 - **Maximum Filament Usage**: 250g per entry
-- **Model**: Pre-supplied design (will be distributed to participants)
+- **Model Specification**: Cylinder - 25mm diameter × 50mm height
+- **Print Mode**: Vase mode (approximately 6 grams of filament)
 
 #### Competition Categories
 
@@ -36,7 +37,9 @@ Experience the clarity of 3D Fuel's "Clearly Natural" filament in this transpare
 
 #### Submission Requirements
 
-- **Weight Verification**: Final print must be weighed to confirm 250g filament limit
+- **Model Compliance**: Cylinder must measure 25mm diameter × 50mm height
+- **Vase Mode**: Must be printed in vase mode (single perimeter wall)
+- **Weight Verification**: Should use approximately 6 grams of filament
 - **Documentation**: Include photos showing transparency (with light sources)
 - **Settings Documentation**: Share printer settings used (layer height, temperature, speed, etc.)
 - **Process Notes**: Brief description of techniques used to achieve clarity
@@ -67,15 +70,45 @@ Experience the clarity of 3D Fuel's "Clearly Natural" filament in this transpare
 ### 📅 Timeline
 
 - **Challenge Announcement**: October 1, 2025
-- **Model Distribution**: October 3, 2025
+- **Model Specification Released**: October 13, 2025
 - **Submission Deadline**: October 28, 2025
 - **Judging Period**: October 29-30, 2025
 - **Winner Announcement**: October 31, 2025
 
-### 💡 Tips for Success
+### <EFBFBD> Creating the Cylinder Model
 
-- Experiment with layer heights (smaller often helps with clarity)
-- Consider post-processing techniques (vapor smoothing, sanding)
-- Optimize print orientation for minimal support material
-- Temperature tuning can significantly impact clarity
-- Consider printing speed adjustments for better layer bonding
+#### Using Bambu Studio
+
+**Step 1: Add Primitive**
+
+1. Open Bambu Studio to a new project
+2. Right-click on the build plate
+3. Select "Add Primitive"
+4. Select "Cylinder"
+
+![Adding Cylinder Primitive](./.images/Oct-Comp-ss1.png)
+
+**Step 2: Resize the Cylinder**
+
+1. Click to resize the cylinder
+2. Uncheck "uniform scale" if checked
+3. Set X and Y to 25mm
+4. Set Z to 50mm
+
+![Resizing Cylinder Dimensions](./.images/Oct-Comp-ss2.png)
+
+#### Alternative Methods
+
+- **Fusion 360**: Create cylinder sketch, extrude to 50mm height
+- **Tinkercad**: Use cylinder shape, adjust dimensions
+- **FreeCAD**: Create cylinder with specified dimensions
+- **Any CAD Software**: Simple cylinder 25mm diameter × 50mm height
+
+### <20>💡 Tips for Success
+
+- **Vase Mode Settings**: Ensure single perimeter, no infill, no top layers
+- **Layer Height**: Experiment with smaller layer heights (0.1-0.2mm) for better clarity
+- **Print Speed**: Slower speeds in vase mode often improve surface quality
+- **Temperature Tuning**: Optimal temperature is critical for transparency
+- **Cooling**: Proper part cooling helps maintain wall quality in vase mode
+- **Post-Processing**: Light sanding or vapor smoothing can enhance clarity